[Design and application of guide device for femoral neck section]

To explore the application effect of a new guide device designed according to the anatomical characteristics of the femoral neck cross section to assist the internal fixation of multiple screw of the femoral neck.

From October to December 2016, 10 adult dry femur specimens, including 7 males and 3 females, aged 37 to 58(47.5±7.5) years old, were selected. Three hollow screws were implanted to simulate the treatment of femoral neck fracture with the new guider technology and the traditional guider technology as the control. The screw location accuracy parameters, screw puncture times, screw parallelism, operation time and fluoroscopy times of the two methods were recorded and compared.

Sixty screws were successfully implanted in 20 specimens. There was no significant difference in screw parallelism, operation time and fluoroscopy times between the two methods(P>0.05). There were significant differences in the distance between screw and cortex, the distance between screw and femoral neck, the area ratio between screw and femoral neck, the distance between screws and the number of screw punctures between two methods(P<0.05). It showed that the new type of guide had more advantages than the traditional method in locating screw accuracy and reducing the number of punctures.

Compared with the traditional technique, the new guider and percutaneous puncture technique under two-dimensional fluoroscopy have better localization of internal fixation screw for femoral neck fracture.